对焊等径三通、四通规格参数表（GB 12459、GB/T 13401）公称通径
DN端部外径D中心至端面 A系列B系列CM1521.318252026.925292533.732383242.438484048.345575060.357646576.1(73)76768088.9898690101.6―95100114.3108105125139.7133124150168.3159143200219.1219178250273.0273216300323.9325254350355.6377279400406.4426305450457.2478343500508.0529381550559―419600610630432
